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Add classpath index support for exploded archives
Update the `Repackager` class so that an additional `classpath.idx` file is written into the jar that provides the original order of the classpath. The `JarLauncher` class now uses this file when running as an exploded archive to ensure that the classpath order is the same as when running from the far jar. Closes gh-9128 Co-authored-by: Phillip Webb <pwebb@pivotal.io>
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130 changes: 130 additions & 0 deletions
130
.../spring-boot-loader/src/main/java/org/springframework/boot/loader/ClassPathIndexFile.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,130 @@ | ||
| /* | ||
| * Copyright 2012-2020 the original author or authors. | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * https://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
|
|
||
| package org.springframework.boot.loader; | ||
|
|
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| import java.io.BufferedReader; | ||
| import java.io.File; | ||
| import java.io.FileInputStream; | ||
| import java.io.IOException; | ||
| import java.io.InputStream; | ||
| import java.io.InputStreamReader; | ||
| import java.net.MalformedURLException; | ||
| import java.net.URISyntaxException; | ||
| import java.net.URL; | ||
| import java.nio.charset.StandardCharsets; | ||
| import java.util.ArrayList; | ||
| import java.util.Collections; | ||
| import java.util.List; | ||
| import java.util.Objects; | ||
| import java.util.Set; | ||
| import java.util.stream.Collectors; | ||
|
|
||
| /** | ||
| * A class path index file that provides ordering information for JARs. | ||
| * | ||
| * @author Madhura Bhave | ||
| * @author Phillip Webb | ||
| */ | ||
| final class ClassPathIndexFile { | ||
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| private final File root; | ||
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| private final List<String> lines; | ||
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| private final Set<String> folders; | ||
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| private ClassPathIndexFile(File root, List<String> lines) { | ||
| this.root = root; | ||
| this.lines = lines; | ||
| this.folders = this.lines.stream().map(this::getFolder).filter(Objects::nonNull).collect(Collectors.toSet()); | ||
| } | ||
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| private String getFolder(String name) { | ||
| int lastSlash = name.lastIndexOf("/"); | ||
| return (lastSlash != -1) ? name.substring(0, lastSlash) : null; | ||
| } | ||
|
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| int size() { | ||
| return this.lines.size(); | ||
| } | ||
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| boolean containsFolder(String name) { | ||
| if (name == null || name.isEmpty()) { | ||
| return false; | ||
| } | ||
| if (name.endsWith("/")) { | ||
| return containsFolder(name.substring(0, name.length() - 1)); | ||
| } | ||
| return this.folders.contains(name); | ||
| } | ||
|
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| List<URL> getUrls() { | ||
| return Collections.unmodifiableList(this.lines.stream().map(this::asUrl).collect(Collectors.toList())); | ||
| } | ||
|
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| private URL asUrl(String line) { | ||
| try { | ||
| return new File(this.root, line).toURI().toURL(); | ||
| } | ||
| catch (MalformedURLException ex) { | ||
| throw new IllegalStateException(ex); | ||
| } | ||
| } | ||
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| static ClassPathIndexFile loadIfPossible(URL root, String location) throws IOException { | ||
| return loadIfPossible(asFile(root), location); | ||
| } | ||
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| private static ClassPathIndexFile loadIfPossible(File root, String location) throws IOException { | ||
| return loadIfPossible(root, new File(root, location)); | ||
| } | ||
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| private static ClassPathIndexFile loadIfPossible(File root, File indexFile) throws IOException { | ||
| if (indexFile.exists() && indexFile.isFile()) { | ||
| try (InputStream inputStream = new FileInputStream(indexFile)) { | ||
| return new ClassPathIndexFile(root, loadLines(inputStream)); | ||
| } | ||
| } | ||
| return null; | ||
| } | ||
|
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| private static List<String> loadLines(InputStream inputStream) throws IOException { | ||
| List<String> lines = new ArrayList<>(); | ||
| BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, StandardCharsets.UTF_8)); | ||
| String line = reader.readLine(); | ||
| while (line != null) { | ||
| if (!line.trim().isEmpty()) { | ||
| lines.add(line); | ||
| } | ||
| line = reader.readLine(); | ||
| } | ||
| return Collections.unmodifiableList(lines); | ||
| } | ||
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| private static File asFile(URL url) { | ||
| if (!"file".equals(url.getProtocol())) { | ||
| throw new IllegalArgumentException("URL does not reference a file"); | ||
| } | ||
| try { | ||
| return new File(url.toURI()); | ||
| } | ||
| catch (URISyntaxException ex) { | ||
| return new File(url.getPath()); | ||
| } | ||
| } | ||
|
|
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| } |
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